Kelson beckwith



(No Milde-1.)

2 sheetssheet 2'. N. BBKWITH.

ELEVATOR.

Patented Oct. 25, 1887.

Enza/esse.:

- UNITED STATES PATENT OEEICE.

NELSON BEOKWITH, OF CAMBRIDGE, MASSACHUSETTS, ASSIGNOR, BY MESN E `ASSIGNMENTS, TO OAPITOLA PILLSBURY BECKWITH, OF SAME PLACE.

ELEVATOR.

SPECIFICATION forming pari: of Letters Patent No. 372,107. dated @einher 25, 1887.

Application filed November 15, 1886. Serinl No. 21 8.926. (No model.)

To aZZ whom't may concern.-

Beit known that I, NELSON BEcxwITH, of Cambridge, in the county of Middlesex, State of Massachusetts, have invented a certain new and useful Improvement in Elevators,of which the following is a description suvfciently full, clear, and exact to enable any personv skilled in the art or science to which said invention appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which* Figure 1 is a front elevation of the well,the gates being represented as closed; Fig.` 2, a rear elevation of the same and of the switch,-y board, some of Vtheparts being shown in vertical section, and the carriage being represented Vas lowered; Fig. 3, alike View showing the carriage raised, the gates open, andthe switchboard removed; Fig. 4., a bottom 'plan view of the carriage; Fig. 5,an enlarged perspective view of a chain plate er block; Fig. 6, an enlarged side elevation showing the ends of the bolts; Fig. 7,a diagram showing the track for the chain plates or blocks, and Fig. 8 a diagram showing the switch-board as constructed when the stories of the building are unequal in height. p

Like letters of reference indicate corresponding parts in the different figures of the drawings.

My invention relates more especially to that class of elevators which are provided with apmparatus for automatically opening and closing the gates of the elevator-well; and it consists in a novel construction and arrangement of parts, as hereinafter more .fully set forth and claimed,the object being to produce a simpler, cheaper, and more effective device of this character than is now in ordinary use.

The nature and operation of the improvementwill be readily understood by all conversant with such matters from the following explanation:

In the drawings,Arepresents the front sidev ofthe elevator-well, B the carriage, and C the gates. The carriage is disposed in the elevatorwell in the usualv manner, and is of the ordinary form and construction excepting as hereinafter described. The gates or doors C are preferably made to slide vertically in grooves or ways a, and consist of one or more sections or leaves, b d, the number of sections Varying according to the height of the room.

At the bottom of the lower section, b, are

disposed laterally-proj ecting flanges f, adapted 5 5 to engage and raise the upper section, d, when the apparatus is in use. One end ofa chain, m, is secured centrally to the top of the section b, the other end being passed over pulleys y y (see Fig. 2) on the inner side of the front wall 6o of the well A above the gates and is secured at z to anendless chain, D, as shown by supplemental sketch on the right side of Fig. 2. The endless chain passes over a pulley, g, disposed in the side of the well A at right angles thereto and a short distance to the right of said gate, (see Fig. 2) thence downward over a pulley. h, (see Fig. 1,) disposed on the outer side of the front wall of the well opposite section Irof the gate; thence upward overv a pulley, i, dis- 7o side ofthe wall to the pulley g at the point of 8o beginning. Verticallyarranged dovetail ways or track p p (see Figs. 3 and 7) are respectively secured to the inner lside ofthe front wall of the well between the pulleys g and m andi and 7n, 85

and on these tracks are disposed traveling blocks or plates P P', (see Fig. 5,) provided o'n one side with a vertical dovetail groove, t, adapted to receive said tracks, and on the opposite side with vertical flanges fu, the lower 9o end of one and the upper end of the other of said flanges being beveled, as shown at w fw. A short lug, S, projects centrally from the body of said block between the iianges o, adapted to be inserted in a link of the endless chain D, which is secured tolsaid block thereby. The track p is cut out on one edge to form the depression U, (see Figs. 5 and 7,)the track p' being provided with a corresponding depression at the switch for the story above.

(Not roo shown.) A flat metallic spring,0, is secured at 20 to the casing, its free end extending into the path ofthe block P, thereby preventing said block from accidentally falling into the depression U, a like spring (not shown) being provided for the corresponding depression in the track 1). A switch board,E, is secured to the front wall ofthe well A,which also forms a casing for the blocks P P and chains D. A vertieallyarranged groove,G,is formed in the board E, the blocks P P' projecting laterally into the same, as shown in Fig. 2, the lower corner ofthe block P on the left and the upper corner ofthe block P on the right ofthe groove being beveled at w, as above described. The course of the groove G is turned or diverged to the left to form the offsets or cams Mdhf, the object of which is hereinafter specifie Disposed on the bottom of the carriage B and iitted to work in the clasp 45 and on screws 5 and Gthere are two bolts, H J, having slots 3 and 4, which permit lateral movement of the bolts on. the screws, the ends K L of said bolts being adapted to run in the groove G ofthe switchboard E, the end Lbeing beveled on its under side and the end K on its upper side, as shown in Fig. G, said bolts be ing provided with springs T Q, supported in eyes 7 and 8, which act to force them outwardly into the groove G.

Pivoted at R on the bottom ofthe carriage B there are two levers, 10 and ll, the end of the long arm ot' the lever 1l working in a lateral slot, 12, in theabolt J, and the end of the longr arm of the lever 10 in a corresponding slot, 13, in the bolt H. A double cam, F, so situated as to engage the short arms of said levers, is mounted on a shaft, Ll, (see Figs. 2 and 4,) which passes through the bottom of the carriage B, and is provided with a wheel, l5, (see Fig. 2,) on its upper end, by which the cam is manipulated.

In the use of my improvement the carriage B, being at the bottom of the elevator-well, as shown in Fig. 2, if it is desired to open the gates as each floor is reached the operator, by means of the wheel 15, turns the cam F until the ends K L of the bolts H J are forced into the groove G in the switchboard E, the distance the wheel 15 is to be turned being indicated by a suitably-marked dial or index (not shown) in connection with said wheel. If the bolts are in the position shown in Fig. 4, the wheel should be turned onequarter part of its circumferenceto the left, thus releasing the short arm of the lever l0 and permitting the spring T to throw the bolt H forward, so that the end K of said bolt will enter the groove G. The carriage is then started in the usual manner, and when the bolts H J reach the block P the end L of the boltJwill engage the lowerend of the flange o on said block, causing it to travel upward on the track p', (see Figs. 2 and 3,) and draw the chain D up from the pulley k, down from pulley l, up from pulley m, and down from pulley g, the block P at the same time being caused to travel downward on its track p and draw the chain :c down over the pulleys y y, thereby lifting section b of the gates C, to which said chain is attached, said gate being raised at the same speed the carriage B travels. Vhen the bolts H J reach the switch or left-hand cam M in the groove G, they are thrown to the left, the slots l2 and 18 in said bolts permitting suioient play to the levers l0 and 1l for this purpose, thereby disengaging the block P' and bolt J, the boltH at the same time engaging the upper end of the block P on the left of the groove and preventing it from being drawn upward by the weight of the gate C. (See Fig. 3.) .As it may happen that when the bolts H J are thrown over by the cam M they willstrlke the side of the block P, the depression U (see Figs. 5 and 7) is provided to permitsaid block to be moved laterally until it shall have descended sufficiently for the bolt H to pass onto it, thus preventing the bolts from being broken or disarranged. The spring O forces the block back into its normal position after the bolts have passed, and also prevents thebloeks from falling into the depression U when the bolts are not in the groove G. The blocks P P are so disposed on the chain D and the chain x constructed of such length that when the carriage reaches the cam M, as described, and is stopped in thensual manner, the gates C are open and held in that position by the bolt H, retaining the block P while the carriage is at rest. When the carriage is started for the floor above, the gates C fall of their own weight, drawing the chain :r down over the pulleys y i/ and pulling up the chain D, attached to the block P, the rapidity with which the gates fall obviously being regulated by the speed with which the elevator permits the block P to as eend. \Vhen the ends K and L ofthe bolts H J reach the cam N in the groove G, the block P is released and stops, the gates being closed and said bolts .thrown into the position they occupied when starting at the bottom'of the well, or into position to engage another block, P, in the groove G for the next floor above, it being understood thatthe elevator at each floor or story is provided with a like system ot' chains and blocks for operating the gates. If it is desired to pass either of theiloors without opening the gates, the operator turns the wheel 15 onequarter part of its circumference to the right, thereby forcing the short arm of the lever 11 out and withdrawing the end L of the bolt J from the groove G, so that it will not engage the block P', connected with the chain for operating the gates of said tloor. In the downward course of the carriage the gates are operated in substantially the same manner as described, the bolt H engaging the blocks P on the top and forcing them down, thereby causing the chains to move i n the same directions they were moved by the bolt J engaging the blocks P' on the upward course of the carriage.

The object of beveling the end of the bolt IOO IIO

H on its upper side and of the bolt J on its lower side, as shown in Fig. 6, and the corresponding ends of the flanges c on the blocks P P', as described, is to enable the bolt H to pass over the descending block P during the upward course of the carriage and the bolt J to pass over the ascending block vP'during the downward course of the carriage without engaging said blocks until they are passed.

In the modification shown in Fig. 8 two cams, 20 and 21, are'employed, each of which is one-half the size of the cam N, the'object being to keep the top of the block P as the carriagerises engaged with the bolt H and still enable the bolt J to engage a block, P', to operate the gate for the story above, to which the carriageV is approaching, the double cams 20 and 21 being necessary only when said story is lower than the story which the carriage has passed; otherwise the block P on the left, being abandoned too soon by t-he bolt H, the gates to which said block is attached would fall without restraint.

The vertical distance between the cams 20 and 21 is of course regulated by the difference in the heights of the stories. 4

It will be obvious that the cams 20 and 21, being but half the size of the cam N, will not move t-he bolt H laterally far enough as the carriage rises to disengage it .from the top of the block P, but that as the carriage continues on its upward course when said bolt reaches the cani 21 it willbe again moved laterally in the same direction and disengaged from said block, the gate in the meantime on the door belowhaving fallen or closed.

It will also be obvious that when the carriage descends the cams 20 and 21 will operate t-he bolt J in connection with the block P' in substantially the same manner as the bolt H is operated in connection with the block P on the upward course of the carriage. I

It will be understood that the cams 20 and '21 are to be used only when the stories differ in height, as above described; also, that the different sections of the gates C run, respectively, each in its own groove a, the upper sec` tion, d, being provided wit-h stops 50, to pre- -vent said section from being lowered too far.

The carriage B is suspended in the well by a rope, K2, and, as it may be raised and lowered by any well-known means for that purpose, it is not deemed essential to describe the same in `order to illustrate my invention.

chain passing around said pulleys, a chain passing over or around a pulley or pulleys journaled on or in said well and having one of its ends secured to said door and the other to said endless chain, two blocks secured to said endless chain and respectively projecting into said groove from'the opposite sides thereof, and twoA bolts or bars adapted to project into said groove and engage said blocks, substantially as described'.

2. In anelevator, the pivoted leverslO and .11, in combination with the bolts H J, springs 'I Q, cani F, shaft 14, wheel 15, carriage B, chain D, and blocks P P', substantially as set forth.

3.l In an elevator, the leaf b, provided with the dangesf, in combination with the leaf d, chain m, and mechanism for raising and lowering said leaves, substantially as described.

4. In an elevator, 'the block P, secured to the chain D and having the oppositely-in clined ends w w, in combination with theendless chain D, carriage B, and bolts H J, having the chamfered or inclined ends L K, and springs TQ, substantially as set forth.

5. In an elevator, the blocks P P', respect ively provided with the oppositely-inclined ends w w, projections S, and grooves t, in combination with the tracks or ways p p', chain D, carriage B, and bolts H J, having the chamfered or inclined ends L K, and springs 'T Q, substantially as described.

6. In an elevator, the switch-board E, provided with the cams M and 20 and 2l, the cams 20 and 2l having, respectively, half the rise of the cam M, and being arranged with respect to each other, substantially as set forth.

7. In an elevator, the switch-board E, provided with the groove G and cams M N, in combination with the chainv D, provided with the blocks P P', pulleys m g kl h i, chain w, pulleys y, door C, carriage B, and bolts H J, substantially as described.

8. In an elevator, a door consisting of two or more leaves adapted to engage each other successively and'slide one over another as the IOO IIO

lowerone is raised, in combination with a well, a carriage and-mechanism for automatically opening and closing the door as the carriage traverses the well, substantially as set forth. l

9. In an elevator, the switch-board E, having the cam-groove G, and' provided with the depressions U, substantially as and for the purpose set forth.

10. In au elevator, the switchboard E, having thevgroove G, spring O, and depression U, in combination with the chain D, blocks P P', and pulleys for said chain, substantially as described.

NELSON BEGKWITH.

Vitnesses:

O. M. SHAW, E. L. SAWYER. "9

IIS

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